Grading machine



D. WHEELER- G'RADING MACHINE Oct. 9, 1945.

Filed July 27, 1942 2 Sheets-Sheet 1 VJW OCt. 9,. D. WHEELER I GRADING MACHINE' Filed July 27, 1942 2 Sheets-Sheet 2 Upper Screen v H [575. B o/fom of C'hu/e' Lower Screen [J 5 0 02/1079 In SIdeTFOme 3mm I mately equal sizes.

and

Patented Oct. 9, 1945 fjgaasasia} cnnninc friu 'inve itien m tes-t sad-la machines and has" for itsobject to provide such a machine so constructed that sand,; gravel, crushed stone and the like may be sorted into a number of approxi- Another object of the invention is to provide end.; Each upperscreen is so arranged as t'o'pass its Ungraded load onto-the 'next'lowe'r screen in a manner to hereinafter be explained ".Beloweach of the screenaexcept' the last screen I8; are located chutes l I, I2 and I3, the bottom walls l4 7 and I of which are hipped so as to incline toin a grading machine a series of stepped screens and means for simultaneously agitating all of 7 said screens.

.Another object of the invention is to provide in a grading machine a plurality of inclined stepped screens and a box of varying depths in which said screens are mounted.

A further object of the invention is to provide a screening box mounted upon a plurality of eccentric agitator shafts. I

A still further object of the inventionis to provide a grading machine comprising a box having a series of stepped screens each succeeding screen being of a finer mesh than the preceding one, and a counterweight for said box.

Another object of, the invention is to provide inagrading device, a sieve box and'agitators at 7 both ends thereof.

Another object of the invention is to provide in a grading machine a" screen box of varying depths carrying a, plurality of screens of varying mesh and a plurality of delivery chutes from each screen.

With the above and such other objects in View as may hereinafter more fully appean'I have invented the machine described in the following specification and illustrated in the accompanying drawings in which:

Figure 1 is a top plan view of machine;

Figure 2 is a side elevational view thereof; vFigure'3 is asection on line 3-3 of Figure 1; Figure 4 is a section on line 4-4 of Figure 1;' Figure 5 is a section on line 5-5 of Figure 1; Figure 6 is a, section on line 6-43 of Figure 3; Figure '7 is a section on line 'I-! of Figure 3;

my improved Figure 8 is a diagrammatic view of a chute arrangement. V

fLike reference characters indicate like parts throughout the following specification andin the several views in the drawings in which I indicates my improved grading machine as an entirety. 2 is sieving box having its lower end 3 much deeper than its upper end 4; its side walls 5 and 6 gradually tapering from its lowerlend 5' to its upper end 6'. Mounted in this box is a series of screens 1, 8, 9 and [0, one below the other instepped relation from its upper end to its lower ward said side walls 5 and 6 respectively. Mounted under each screen 1, 8, etc. are receiving plates I6, I I etc., upon which the screened material from the screen above passes, and as the lower ends of these plates project over the next lower screen, the material thereon is joggled down onto said next screen, while the material remaining upon the screen is joggled off onto the inclined walls of thechutes H, l2 etc., the lower ends of which project through openings 18, I9, and 20 and l8 l9 and 20' in said side walls 5 and 6.

Depending from the box 2 and securely fixed thereto are roller bearing journal boxes 23, 24, and 26 for the vibrator shafts 21 and 28, the

former located transversely of the box at its upper end 29, and the latter located near the lower end in the same manner.

The outer ends 21' and 21" of shaft 21 are supported in bearings 3| and 32 mounted on the frame timbers 33 and 34', and the outer ends 28' and 28" of shaft 28 are supported in'bearings 35 and 35 mounted on said timbers 33 and 34. The shaft 21 is provided with three eccentric enlargements 31, 38 and 39, the former and latter of which operate in the'bearings 23 and 24 respectively. The shaft 28 is also provided with three eccentric enlargelments or cams 40, M and 42, the first and last of which operate in the bearings 25 and 26. Th eccentric cams 38 and 4| are located centrally of said shafts 21 and 28 and support roller bearings 43 and 44 in which they operate, and to Mounted fixedly on the free end 28' of shaft end 28" is keyed a bevel gear 41 meshed with a like gear 48 fixed on the transmission shaft 49 supported upon bearings 50 and 5| mounted on the box timber 2 by means of bracket bearings 52 and 53. Fixed on the upper end of shaft 49 is a mitre gear 54meshed with a similar gear 55 fixed on the outer end of shaft 21. Any material remaining on the last screen H] is deposited from its end 55. Eccentric shafts 21 and 28 so turned and timed as to give the screen box and counter weight a circular throw. The countervegetables including tomatoes and in the latter case I use a cord screen with a cotton fabric receiving plate located under the screens to avoid bruising the vegetables.

Having now described my invention, that which I claim to be new and desire to procure by Letters Patent is: i

1. In a grading machine, in combination, a

pair of spaced stationary frame members, a pair,

of spaced horizontal shafts extending transversethe same, each pair of journal boxes receiving the outer eccentrics of one of said shafts, an elongated counterweight bar having spaced bearings fixed thereon and receiving the intermediate eccentrics of said shafts, and means for rotatably driving said shafts simultaneously at the same rate of speed and in the same direction.

I 2. In a grading machine, a gyratory screening device includin a forwardly inclined elongated box having a series of horizontal screens mounted therein" in stepped'relation with the forward end portion of each screen projecting over the rear end portion of the next screen therebelow, a forwardly inclined chute plate mounted ly of and journaled on said frame members,.:said-i ;beldw the rear portion of each screen and proshafts being arranged in different. horizontal planes, each of said shafts having outereccen-' trics near the ends thereof and-:Eassinglatinneh:- eccentric midway between the outer eccent1ics,

the inner eccentrics of said shafts being displaced-a relative-:totheioutereccent-rics,- a screening -device --includings an. inclined ,box mavingga: pair of transversely; aligned journal:- boxes fixed; ionethe. bottom: thereof ineara each tend of jectingpver the rear end of the next lower screen, a" transverse" discharge chute mounted at the forwardendrof'. each screen to receive the material which fails to pass through said screen, eaclr'tran'sverse chute having oppositely and outwardlyfinclined lhalfeportions projecting through opposite sides of. ,the.box,.and meansto positively yrate said. screening devicel in a .iverticalspath.

DELBERT .WHEELER. 

